Spiriferida

A Dictionary of Earth Sciences | 1999 | 257 words | Copyright

Spiriferida (spiriferids; class Articulata) Order of Brachiopoda, whose members have spiral brachidia, punctate or impunctate biconvex shells, and a large body cavity. They first appeared in the Middle Ordovician, and are last known from the Lower Jurassic.

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AILSA ALLABY and MICHAEL ALLABY. "Spiriferida." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. 28 May. 2012 <http://www.encyclopedia.com>.

AILSA ALLABY and MICHAEL ALLABY. "Spiriferida." A Dictionary of Earth Sciences. 1999. Encyclopedia.com. (May 28, 2012). http://www.encyclopedia.com/doc/1O13-Spiriferida.html

AILSA ALLABY and MICHAEL ALLABY. "Spiriferida." A Dictionary of Earth Sciences. 1999. Retrieved May 28, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O13-Spiriferida.html

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